Burglar-alarm.



S. HARRIS.

BURGLAR ALARM.

APPLICATION FILED DEG.20, 1912.

Patented Aug. 11, 1914.

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un macaw 6 Hum SANFORD HARRIS, OF MONROVIA, CALIFORNIA.

BURGLAR-ALARM.

Specification of Letters Patent.

Patented Aug. 11, 1914.

Application filed December 20, 1912. Serial No. 737,885.

To all whom it may concern Be it known that I, SANFORD HAnnIs, a citizen of the United States, residing at Monrovia, in the county of Los Angeles and State of California, have invented new and uesful Improvements in Burglar-Alarms, of which the following is a specification.

An object of the invention is to provide an alarm for use on doors and windows for preventing the intrusion of burglars orother undesirable room.

The invention embodies among other features a device adapted to be supported on the casing of a door or window and operable to fire a cartridge or cap to produce a detonating sound when the door or window is raised. I i

In the further disclosure of the invention reference is to be had to the accompanying drawings constituting a part of this specification in which like reference characters denote corresponding parts in all the views, and in which:

Figure 1 is a side elevation of the device showing same in applied position to a window casing. Fig. 2 is a vertical transverse sectional view taken on the line 22 of Fig. 1. Fig. 3 is a horizontal sectional view taken on the line 3-3 in Fig. 2.

Referring more particularly to the views use is made of a bracket 10 supported on a casing 11 of a window sash 12, the said casing having a tubular portion 13 carrying a tubular member 14 upon which is mounted to swing a barrel 15 having the upper end thereof flared and the lower end thereof constituting a chamber 16 adapted to receive a cartridge 17 a breech member 18 being wedged or otherwise secured in the upper end of the tubular member 14 to retain the cartridge 17 in the chamber 16, the barrel 15 being adapted to vertically aline with the tubular member 14 when the said barrel is in closed position, a lug 19 being formed in the barrel 15 adapted to be engaged by the locking member 20, mounted to swing on the tubular member 1 1 and engaged by an expansible helical spring 21 to normally retain the locking member in looking position, it being seen by referring to Fig. 2 that the barrel 15 can be swung out of alinement with the tubular member 14 when it is desired to extract an exploded cartridge therefrom or place a new cartridge in the chamber 16 of the barrel.

persons in a building or A firing member 22 is mounted to slide in the tubular member 14, the said firing member terminating at one end of the pin 23 adapted to engage the usual cap of the cartridge 17 and explode the same, the said pin being operable with the firing member 1n the cartridge member 18, the said firing pin having a frustro conical head 24 and the said breech member 18 being also of frustro conical shape at the lower end thereof and adapted to be engaged by the frustro conical head of the firing pin to limit the upward movement of the firing member 22. A plate 25 is rigid on the firing member 22 in the tubular member 14 and-isoperable with said firing member, the other side of the said plate being engaged by the upper end of the expansible helical spring 26 with the lower end of the said spring engaging 'the plate 27 having threaded connection with the lower end of the tubular member 14, provided with an opening through which the firing member 22 loosely extends, the lower end ofthe firing member being bent laterally to form a hook 28 adapted to engage the stop member 29, secured to the casing 11 thus retaining the firing member in firing position and holding same against expansible action of the spring 26 as will be seen by referring to Fig. 2, the hook 28 of the firing member being adapted to be engaged by an inclined edge 30 of the trigger 31 secured to the sash 12, when the sash. is raised relatively to the casing 11. A flared shield 32 is removably supported on the upper end of the barrel 15 as shown, the said shield being provided to prevent any sparks or flame from the cartridge from marring or mutilating the casing or sash.

In the use of the device described the firing member 22 is drawn downwardly against the expansible action of the spring 26 until the hook 28 thereof engages the lower edge of the stop member 29 thus retaining the firing member in firing position, it being readily understood that at this time, the barrel 15 is loaded, the cartridge 17 having been placed in the chamber 16 thereof in a manner described hereafter. Now when the window sash 12 is raised the inclined edge 30 of the trigger 31 will engage the hook 28 of the firing member 22 thus imparting a turn ing movement to the firing member and disengaging the hook 28 from the stop member 29, thus releasing the firing member so that the same will be forced upwardly by the ex readily used on doors, windows, and various other closures the said device being preferably secured to the side of the casing, of the closure so as not to interfere with the operation of the closure when the device'is not in use. By mounting the barrel 15 toswing on the tubular member 14 the exploded cartridge can be readily removed from the chamber 16; and a new cartridge placed therein and the barrel and tubular member can furthermore be readily cleaned.

Having thus described the invention, What is claimed'a's new is A burglar "alarm comprising' a bracket adapted for attachment to a window casing, a vertically disposed :cylinder carried by the bracket and having its upper end provided with a firing chamber the'said: firing chamberhaving upper terminals of its 1 inner wall fiaring upwardly and in the direction member of the upper terminal of the firing chamber, a shield located at the upper end of the firing chamber and comprising a socket adapted to receive the upper end of the firing chamber and upwardly flaring side walls extending from the socket member and having the inner surfaces flush with the flaring inner walls of the firing chamber, the said side walls of the shield having their upper ends connected by a curved top, the said shield having its front face opened and having its rear wall extending upwardly from the socket and curved outwardly and gradually merging into the sa1d curved top, and providing a baflle at its point of uncture with the top, whereby the wadding of the cartridge may be' deflected through the open face of the shield.

In testimony-whereof I- aflix my signature in presence of twowitnesses.

SANFORD HARRIS.

Witnesses:

JOHN DECKER, JAMEs L. QUIGGLE.

Copies of this patent maybe obtained for five cents each, by addressing the Commissioner of Patents,

' Washington, D. 0. 

